sPHENIX discussion of the superconducting solenoid

["Yip, Kin" <kinyip AT bnl.gov>]

Hi,

 

Piyush, thanks a lot !   2.3 H is close to what Ansaldo has measured ~20 years ago (2.19 H).  That’s good.  This cleared the worry of

early inductance measurements with AC (which obtained the value of 0.074 H at 20 Hz).

 

Just in case people wondered.  Ray Ceruti has also confirmed to me earlier that he’s done the leak checks (using mass spectrometer etc.)

as prescribed by the Traveler (for Inspection/Acceptance).   So, to me, the “Inspection/Acceptance” has been successfully completed

(even though we haven’t got a copy of the completed Traveler with results yet from Henry Hocker) and the solenoid magnet properties

at room temperature seems proper J   

 

… A smart engineer commented to me that you never know until it’s cold J  I guess we’ll see ….

 

Kin

 

From: Joshi, Piyush
Sent: Friday, April 10, 2015 6:56 PM
To: Yip, Kin; Lambiase, Robert
Cc: Wanderer, Peter
Subject: sPhenix DC Inductance

 

Kin,

DC inductance of the Babar-sPhenix magnet was confirmed to be 2.3H. Measurement was done today morning by ramping the magnet to 2A at 0.1A/S and deducing Ldi/dt voltage from total voltage across it.

Attached are the plots showing voltages and current.

Piyush 

---

From: Kin Yip [kinyip AT bnl.gov]
Sent: Thursday, April 09, 2015 2:16 PM
To: Joshi, Piyush; Lambiase, Robert
Subject: Re: do it quick if you want to do ...

Hi Piyush,

I got your phone call as well as this email.   Thank you very much !    Please do keep us posted for your result (of inductance measurement).

Kin

On 04/09/2015 02:09 PM, Joshi, Piyush wrote:

Kin,

We have to do some set up before we can perform ramp test. Should be done by tomorrow.

Piyush

 

From: Kin Yip [mailto:kinyip AT bnl.gov]
Sent: Thursday, April 09, 2015 10:12 AM
To: Joshi, Piyush; Lambiase, Robert
Subject: do it quick if you want to do ...

 

Hi Piyush and Bob,

People want to break apart the junction box etc.   Could you please guys make a ramp-test/measurement as soon as possible ?
Otherwise, you may not have the opportunity  or  it'll be some pain to re-arrange .... 

Can you please act quickly ?

Kin

 

Attachment: sPhenix Dc Inductance.pptx
Description: sPhenix Dc Inductance.pptx